Looks like some files have changed and patches need to be changed accordingly
===> Patching for libnettle-3.10.1p0 ===> Applying OpenBSD patch patch-Makefile_in Hmm... Looks like a unified diff to me... The text leading up to this was: -------------------------- |Index: Makefile.in |--- Makefile.in.orig |+++ Makefile.in -------------------------- Patching file Makefile.in using Plan A... Reversed (or previously applied) patch detected! Assume -R? [y]